Driveability for the experienced., Diag codes 35, 42. Options

[ScottDavid]

Hello Toyota enthusiasts.

Well Long story short Im obviously new here. Not to working on cars....New to Toyota though.

I swapped a 93 jap spec 3sgte into a 96 gt celica. Runs great but after a la hot of test driving and quality checking I had only two diag codes.

35 - Turbo Charging pressure sensor signal
42 - Vehicle speed sensor signal.

As far as the T/C pres sensor. I have a steady 4.98v reference while idling, cruising and boosting.
I have a varying signal voltage with is .1682v @ light throttle which will increase with load to WOT @ 4.97v
The ground circuit is always grounded.

Now, as far as driveability, I noticed that while the engine is normal operating temp its boosting fin, 7-10 psi.
Great performance!

After the engine is fully warm....I was WOT and felt a slight loss of acceleration along with a slight drop in boost. And after the check engine light. max boost 6-7 psi.

Now, The wiring is all cherry, because I did it. My continuity checks are fine from sensor to ecm.

Ok, so the stock 3sgte jap spec vehicle has a turbo gauge built into the cluster....I dont have the stock cluster, I have an aftermarket gauge.

As far as code 42.....Have not tested yet.

Has anyone had this issue or has info on my driveability issue? I will appreciate it.

-Scott

[ScottDavid]

As far as the T/C pres sensor. I have a steady 4.98v reference while idling, cruising and boosting.

Then your either not testing the right wire, or your map is not plugged in.
The map should have 3 wires. One sends a constant 5v, one is ground, and one is signal going back from the map to the ecu. That wire should have voltage on a 0-5v scale that varies with boost/vac. The ecu is trying to tell you that its not seeing that signal back from the map by throwing code 42.

Thanks for the link... A lot of OT talk in it though.

If you scroll down, you would see how to do the wiring for the speedo.

I already posted my measurements, and I do know what the t/c pres. sensor looks like, where it is, and its connected. Code 42 is for the speedo circuit, 35 is the code to turbo pressure sensor signal wire.
Thanks though.